What an exact description. As a very effective cure we used to water tender frozen plants with hot water in the rose can. It had to be really hot to be tepid in the few minutes to get to the plants. But, one has to get up early on such frosty mornings for this to be effective. No matter how twisted and damaged the plant looks it will recover in seconds. Of course the warm weather stops the freezing process. This for plants under cover: an accidentally forgotten plant with the whole pot frozen solid is another matter. If the actual bulb is frozen it's gone for good. But, the drainage must be perfect or after the "hot shower" the mix would be too wet facing the next frost.